The SMC D-97 type is a direct-mount **contact output auto switch (reed switch)** used to detect the piston position of pneumatic cylinders (air cylinders). It is a standard sensor mainly used for space-saving small cylinders. The main features and specifications are summarized in Japanese. Main Specification Items: Model Number: D-97; Type: Contact output (reed switch); Wiring Method: 2-wire; Output Direction: Side exit (grommet); Applicable Load: Relay, PLC (programmable controller); Load Voltage: DC24V; Load Current Range: 5～40mA; Internal Voltage Drop: 2.4V or less; Indicator Lamp: Yes (red LED lights up when ON); Protection Structure: IP67 (dustproof/waterproof). Main Features of D-97: Space-saving design: Because it can be directly inserted into the cylinder groove, mounting brackets are not required, making it suitable for miniaturization of equipment. Side exit lead wires: Since the wires come out parallel to the sensor body, wiring is easy even in places where there is no height clearance. Reliable operation check: Because it has a red LED indicator lamp, you can check at a glance whether the cylinder is in the detection position. Points to note when using: Polarity (plus/minus): Although it is a 2-wire type, it is necessary to match the polarity to light the indicator lamp correctly. Usually, brown is plus (+), and blue is minus (-). Surge protection: When driving inductive loads such as relays, the switch may be damaged, so the use of a surge absorption circuit (protection circuit) is recommended.